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Manipulating Ion Migration for Highly Stable Light-Emitting Diodes with Single-Crystalline Organometal Halide Perovskite Microplatelets

Authors :
Mingming Chen
Thomas Geske
Xin Shan
Zhibin Yu
Junqiang Li
Source :
ACS Nano. 11:6312-6318
Publication Year :
2017
Publisher :
American Chemical Society (ACS), 2017.

Abstract

Ion migration has been commonly observed as a detrimental phenomenon in organometal halide perovskite semiconductors, causing the measurement hysteresis in solar cells and ultrashort operation lifetimes in light-emitting diodes. In this work, ion migration is utilized for the formation of a p-i-n junction at ambient temperature in single-crystalline organometal halide perovskites. The junction is subsequently stabilized by quenching the ionic movement at a low temperature. Such a strategy of manipulating the ion migration has led to efficient single-crystalline light-emitting diodes that emit 2.3 eV photons starting at 1.8 V and sustain a continuous operation for 54 h at ∼5000 cd m–2 without degradation of brightness. In addition, a whispering-gallery-mode cavity and exciton–exciton interaction in the perovskite microplatelets have both been observed that can be potentially useful for achieving electrically driven laser diodes based on single-crystalline organometal halide perovskite semiconductors.

Details

ISSN :
1936086X and 19360851
Volume :
11
Database :
OpenAIRE
Journal :
ACS Nano
Accession number :
edsair.doi.dedup.....e8ac9fdf575a4ba75010599ccc5bcaa4